C# | Remove all elements from OrderedDictionary

Last Updated : 01 Feb, 2019

OrderedDictionary.Clear method is used to remove all elements from the OrderedDictionary collection. Syntax:

public void Clear ();

Exception: If the OrderedDictionary collection is read-only then it will throw NotSupportedException. Below given are some examples to understand the implementation in a better way: Example 1:

CSHARP

// C# code to remove all elements
// from OrderedDictionary
using System;
using System.Collections;
using System.Collections.Specialized;

class GFG {

    // Driver method
    public static void Main()
    {

        // Creating a orderedDictionary named myDict
        OrderedDictionary myDict = new OrderedDictionary();

        // Adding key and value in myDict
        myDict.Add("key1", "value1");
        myDict.Add("key2", "value2");
        myDict.Add("key3", "value3");
        myDict.Add("key4", "value4");
        myDict.Add("key5", "value5");

        // Displaying the number of element initially
        Console.WriteLine("Number of elements are : " + myDict.Count);

        // Displaying the elements in myDict
        foreach(DictionaryEntry de in myDict)
            Console.WriteLine(de.Key + " -- " + de.Value);

        // Removing all elements from OrderedDictionary
        myDict.Clear();

        // Displaying the number of element initially
        Console.WriteLine("Number of elements are : " + myDict.Count);

        // Displaying the elements in myDict
        foreach(DictionaryEntry de in myDict)
            Console.WriteLine(de.Key + " -- " + de.Value);
    }
}

Output:

Number of elements are : 5
key1 -- value1
key2 -- value2
key3 -- value3
key4 -- value4
key5 -- value5
Number of elements are : 0

Example 2:

CSHARP

// C# code to remove all elements
// from OrderedDictionary
using System;
using System.Collections;
using System.Collections.Specialized;

class GFG {

    // Driver method
    public static void Main()
    {

        // Creating a orderedDictionary named myDict
        OrderedDictionary myDict = new OrderedDictionary();

        // Adding key and value in myDict
        myDict.Add("A", "Apple");
        myDict.Add("B", "Banana");
        myDict.Add("C", "Cat");
        myDict.Add("D", "Dog");

        // Displaying the number of element initially
        Console.WriteLine("Number of elements are : " + myDict.Count);

        // Displaying the elements in myDict
        foreach(DictionaryEntry de in myDict)
            Console.WriteLine(de.Key + " -- " + de.Value);

        // Removing all elements from OrderedDictionary
        myDict.Clear();

        // Displaying the number of element initially
        Console.WriteLine("Number of elements are : " + myDict.Count);

        // Displaying the elements in myDict
        foreach(DictionaryEntry de in myDict)
            Console.WriteLine(de.Key + " -- " + de.Value);
    }
}

Output:

Number of elements are : 4
A -- Apple
B -- Banana
C -- Cat
D -- Dog
Number of elements are : 0

Note:

After calling the Clear method, the Count property is set to zero.
References to other objects from elements of the collection are also released.
The capacity of dictionary is not changed as a result of calling this method.

Reference:

https://docs.microsoft.com/en-us/dotnet/api/system.collections.specialized.ordereddictionary.clear?view=netframework-4.7.2

C# | Remove entry with specified key from OrderedDictionary

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